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Shiyali Ramamrita Ranganathan, (born Aug. 9, 1892, Shiyali, Madras, India—died Sept. 27, 1972, Bangalore, Mysore), Indian librarian and educator who was considered the father of library science in India and whose contributions had worldwide influence.

Ranganathan was educated at the Hindu High School in Shiyali, at Madras Christian College (where he took B.A. and M.A. degrees in mathematics in 1913 and 1916), and at Teachers College, Saidapet. In 1917 he joined the faculty of Government College, Mangalore. He subsequently taught at Government College, Coimbatore, in 1920 and at Presidency College, University of Madras, in 1921–23. In 1924 he was appointed first librarian of the University of Madras, and in order to fit himself for the post he traveled to England to study at University College, London. He took up the job at Madras in earnest in 1925 and held it until 1944. From 1945 to 1947 he served as librarian and as professor of library science at Hindu University in Vārānasi (Banaras), and from 1947 to 1954 he taught at the University of Delhi. During 1954–57 he was engaged in research and writing in Zürich. He returned to India in the latter year and served as visiting professor at Vikram University, Ujjain, until 1959. In 1962 he founded and became head of the Documentation Research and Training Centre in Bangalore, with which he remained associated for the rest of his life, and in 1965 he was honoured by the Indian government with the title of national research professor in library science.

Ranganathan’s chief technical contributions to library science were in classification and indexing theory. His Colon Classification (1933) introduced a system that is widely used in research libraries around the world and that has affected the evolution of such older systems as the Dewey Decimal Classification. Later he devised the technique of “chain indexing” for deriving subject-index entries. Other works of his included Classified Catalogue Code (1934), Prolegomena to Library Classification (1937), Theory of the Library Catalogue (1938), Elements of Library Classification (1945), Classification and International Documentation (1948), Classification and Communication (1951), and Headings and Canons (1955). His Five Laws of Library Science (1931) was widely accepted as a definitive statement of the ideal of library service. He also drafted plans for a national and several state library systems, founded and edited several journals, and was active in numerous professional associations.

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